Robert j



R. J. BOLE.

CIRCULAR SAW.

Patented Mar. 26, 1890.

WII/VESSES' OZ,

UNITED STATES PATENT OFFICE.

ROBERT J. BOLE, OF BEAVER FALLS, PENNSYLVANIA, ASSIGNOR TO THE CHAMPIONSAXV COMPANY, (LIMITED,) OF SAME PLACE.

Cl RCU LAR SAW.

SPECIFICATION forming part of Letters Patent No. 424,263, dated March25, 1890. Application filed August 17, 1889. Serial No. 321 061. (Nomodel.)

To all whom it may concern:

Be it known that I, ROBERT J. BOLE, a citizen of the United States, anda resident of Beaver Falls, in the county of Beaver and State ofPennsylvania, have invented certain new and useful Improvements inCircular Saws; andI do hereby declare that the following is afull,clear, and exact description of the invention, which will enable othersskilled in the art to which it appertains to make and use the same.

My invention relates to improvements in circular saws, and relatesespecially to the teeth of this character of saws.

I11 circular saws in general use many defects have been found to exist,some of which are the peculiar shape and arrangement of the teeth, whichthrow the strain on the circumference of the saw, thereby often causingbuckling; also, the size of the teeth requires a large portion of therim of the saw to be removed, thus weakening the saw; and also, the sizeof the teeth in general use is such as to prevent the insertion of asufficient number to adapt the saw for heavy feed.

The object of my invention is the production of a saw-tooth which willovercome these objections, first, by fastening the tooth in such mannerthat the strain will be brought on the diameter of the saw; second, byproviding a tooth which will occupy a small amount of space in the rimof the saw, and, third, to provide a saw which will be simple, durable,and inexpensive.

To attain the desired objects, the invention consists of the saw andtooth illustrated, de-

vided with the recesses or openings 0 to receive the teeth D. The rearwall 0 of the recesses O is beveled to fit in a corresponding groove inthe tooth, and the front Wall 0 is provided with a beveled groove andprojects inward at 0 and below the projection is out out at 0 and issmooth at c.

The tooth D has its rear wall d and lower end formed with a beveledgroove (1, which receives the correspondingly-beveled wall 0 of therecess, and a portion of the front-wall d of the tooth is beveled toenter the beveled groove of the projection 0 and the tooth is cut outbelow the portion (1 as at (1 to form, in connection with the cut-outportion 0 an opening d, and the toot-h is smooth at d to fit in thesmooth portion 0 of the recess, and in the opening d is inserted arivetE fortastsuing the tooth in position.

It will thus be seen that I provide a tooth of simple construction,which may be readily and easily detached, which will be firmly retained,and which is thoroughly efficient for the purposes intended.

Having thus described my invention, whatI claim as new, and desire tosecure by Letters Patent, is

In a saw, the combination with a saw having the recess G,and theinWardly-projecting lip 0 provided with a beveled groove, theoutout-portion 0 below said lip, the smooth portion 0 and beveled rearwall, of the tooth D,

fitting in the recess 0 and having a curved cut-out portion forming anopening, in connection with the cut-out portion of the toothrecess, andthe rivet fitting in the opening thus formed, substantially asdescribed.

In testimony that I claim the foregoing as my own I have hereuntoaffixed my signature in presence of two witnesses.

' ROBERT J. .BOLE.

WVitnesses:

J F. MERRIMAN, FRANK NAIR.

